.banner {
  width: 100%;
  position: relative;
  height: 554px;
  overflow: hidden;
  border-radius: 8px;
}
.banner-main {
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
  transition: all .5s;
}
.banner-main img {
  width: 1220px;
}
.banner-btn {
  /* display: none; */
  width: 100%;
  height: 50px;
  position: absolute;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  color: rgba(255, 255, 255, 0.7);
}
.banner-btn div {
  width: 50px;
  height: 50px;
  text-align: center;
  cursor: pointer;
  font-size: 40px;
  font-weight: 900;
  transition: all .3s;
}
.banner-btn div:hover {
  text-shadow: 0 0 10px white;
  color: white;
}
.banner-btn div:nth-child(1) {
  float: left;
}
.banner-btn div:nth-child(2) {
  float: right;
} 
.banner-btn img {
  height: 1em;
  width: 1em;
}
.banner ul {
  position: absolute;
  bottom: 40px;
  left: 45% ;
  display: flex;
}
.banner ul li {
  cursor: pointer;
  width: 10px;
  height: 10px;
  margin: 2vw;
  margin-bottom: 1vw;
  border-radius: 50%;
  opacity: 0.5;
  background-color:  white;
}